# OnSIP vs Callcentric SMS

The clearest difference is review sentiment: Callcentric SMS at 73% against OnSIP's 8%. Callcentric SMS also leads on rating (4.7 vs 2.4) and update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Callcentric SMS holds the better App Store score, 4.7 against 2.4. Both are backed by a comparable volume of ratings — 67 and 202 respectively. Written reviews point the same way: 8% of OnSIP's written reviews are positive against 73% of Callcentric SMS's.

OnSIP ships an update every 2 months, Callcentric SMS every 3 weeks. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | OnSIP | Callcentric SMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (67 ratings)](https://appshunter.io/ios/app/onsip/id1253050184/reviews) | **[4.7 (202 ratings)](https://appshunter.io/ios/app/callcentric-sms/id1523913647/reviews)** |
| Number of ratings | 67 | **202** |
| Positive reviews | 7.7% of reviews | **72.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 26 MB | 49 MB |
| Requires iOS | 17.4 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [OnSIP](https://appshunter.io/developer/1253050183) | [Callcentric, Inc.](https://appshunter.io/developer/454823206) |

## What reviewers say

### OnSIP

[App page](https://appshunter.io/ios/app/onsip/id1253050184)

This app extends your business phone system to your mobile device, enabling HD voice and video calls, contact monitoring, and voicemail management. Stay connected with clients and colleagues from anywhere, without needing extra hardware.

**Highlights:** HD voice and video calls, Voicemail management, Contact availability monitoring, Call history, Remote work connectivity

**Features:** Vision Pro support

**In-app purchases:** none


### Callcentric SMS

[App page](https://appshunter.io/ios/app/callcentric-sms/id1523913647)

Send and receive SMS messages using your Callcentric phone numbers. This app offers real-time messaging, contact list integration, and dark mode support. It requires an active Callcentric account and an SMS Access Plan.

**Highlights:** Real-time SMS messaging, Dark Mode support, Contact list integration, Multiple number support, Manage SMS functionality per number, Multi-account support, Customizable default SMS number

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OnSIP free?

OnSIP is free to download, with no in-app purchases.

### Is Callcentric SMS free?

Callcentric SMS is free to download, with no in-app purchases.

### Which has better reviews, OnSIP or Callcentric SMS?

Callcentric SMS is rated higher. OnSIP averages 2.4 out of 5 from 67 ratings, while Callcentric SMS averages 4.7 from 202 ratings.

### Do OnSIP or Callcentric SMS have ads?

Neither OnSIP nor Callcentric SMS shows ads.

### Which is updated more often, OnSIP or Callcentric SMS?

OnSIP ships an update every 2 months, and Callcentric SMS every 3 weeks. Most recently, OnSIP was updated on October 5, 2026 and Callcentric SMS on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*